I found the sniping to be far less frustrating in BL2 than BL1, which it sounds like you'll appreciate. They also polished up the UI, to make inventory management better. I also like the way they strengthened the brand identities of the various gun companies in BL2. In the first game, I rarely paid attention to what company made what gun, but in the second, it becomes essential, because they have very different design philosophies.
Both great games though, and it's good to play both.
Oh, and if you thought skags were bad, you're going to LOVE BL2's Stalkers. >